The discus throw is a track and field event in which an athlete throws a heavy d

Question

The discus throw is a track and field event in which an athlete throws a heavy disc, called a discus, in an attempt to mark a farther distance than their competitors. To throw a discus, the thrower holds it with a fully outstretched arm. Starting from rest, he begins to turn with a constant angular acceleration. The diameter of the circle in which the discus moves is about 1.8 m. If a thrower takes 1.0 s to complete one revolution, starting from rest, what will the speed, v, of the discus be at release?

Explanation / Answer

from the given data,

radius of the cirlce, r = d/2

= 1.8/2

= 0.9 m

angular speed of the disk in his hand, w = angular displacement/time taken

= 2*pi/1

= 6.28 rad/s

the speed at whihc the disk is realesed,

v = r*w

= 0.9*6.28

= 5.65 m/s

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